A couple thoughts on the matter...
1) As previously mentioned, Northwestern loves people with WE, almost to the point of taking people with WE exclusively. If I remember correctly, the number was 92% of admits last year had previous WE.
2) And the reason why I am delaying my application to law school...if you apply straight out of undergrad, your resume and choices after law school will be limited, in a sense. I may be off-base here, so someone can feel free to correct me if I'm wrong. Coming straight out of UG to law school, with no true WE, your resume, probably besides the odd summer internship, college accomplishments, student gov't exp, etc. is relatively bare in regards to real-world experience. And as such, coming out of law school, it will be expected that you practice. If you choose not to do so and want to apply for a job outside of practice, while your law degree will be very helpful and impressive, one would think that the employer would either take a) the candidate with previous experience in the field or b) the candidate with previous experience in the field and the law degree, as opposed to someone with just the law degree. So, at least in my view, putting off applying for a year or two wouldn't necessarily be a terrible idea. You could take the time to do something you truly enjoy that isn't necessarily high-paying that you wouldn't otherwise have the opportunity to pursue (and after law school, may not be such a great idea...there are loans to be paid), mature a little bit, and build up your resume in order to open up a greater number of options after law school besides practicing behind at a BIGLAW firm.